A1KAB7 · ILVC_AZOSB
- ProteinKetol-acid reductoisomerase (NADP(+))
- GeneilvC
- StatusUniProtKB reviewed (Swiss-Prot)
- Organism
- Amino acids338 (go to sequence)
- Protein existenceInferred from homology
- Annotation score4/5
Function
function
Involved in the biosynthesis of branched-chain amino acids (BCAA). Catalyzes an alkyl-migration followed by a ketol-acid reduction of (S)-2-acetolactate (S2AL) to yield (R)-2,3-dihydroxy-isovalerate. In the isomerase reaction, S2AL is rearranged via a Mg-dependent methyl migration to produce 3-hydroxy-3-methyl-2-ketobutyrate (HMKB). In the reductase reaction, this 2-ketoacid undergoes a metal-dependent reduction by NADPH to yield (R)-2,3-dihydroxy-isovalerate.
Catalytic activity
- (2R)-2,3-dihydroxy-3-methylbutanoate + NADP+ = (2S)-2-acetolactate + NADPH + H+
Cofactor
Note: Binds 2 magnesium ions per subunit.
Pathway
Amino-acid biosynthesis; L-isoleucine biosynthesis; L-isoleucine from 2-oxobutanoate: step 2/4.
Amino-acid biosynthesis; L-valine biosynthesis; L-valine from pyruvate: step 2/4.
Features
Showing features for binding site, active site.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Binding site | 24-27 | NADP+ (UniProtKB | ChEBI) | ||||
Sequence: YGSQ | ||||||
Binding site | 47 | NADP+ (UniProtKB | ChEBI) | ||||
Sequence: R | ||||||
Binding site | 52 | NADP+ (UniProtKB | ChEBI) | ||||
Sequence: S | ||||||
Active site | 107 | |||||
Sequence: H | ||||||
Binding site | 133 | NADP+ (UniProtKB | ChEBI) | ||||
Sequence: G | ||||||
Binding site | 190 | Mg2+ 1 (UniProtKB | ChEBI) | ||||
Sequence: D | ||||||
Binding site | 190 | Mg2+ 2 (UniProtKB | ChEBI) | ||||
Sequence: D | ||||||
Binding site | 194 | Mg2+ 1 (UniProtKB | ChEBI) | ||||
Sequence: E | ||||||
Binding site | 226 | Mg2+ 2 (UniProtKB | ChEBI) | ||||
Sequence: E | ||||||
Binding site | 230 | Mg2+ 2 (UniProtKB | ChEBI) | ||||
Sequence: E | ||||||
Binding site | 251 | substrate | ||||
Sequence: S |
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | cytosol | |
Molecular Function | ketol-acid reductoisomerase activity | |
Molecular Function | magnesium ion binding | |
Molecular Function | NADP binding | |
Biological Process | isoleucine biosynthetic process | |
Biological Process | valine biosynthetic process |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameKetol-acid reductoisomerase (NADP(+))
- EC number
- Short namesKARI
- Alternative names
Gene names
Organism names
- Organism
- Strain
- Taxonomic lineageBacteria > Pseudomonadota > Betaproteobacteria > Rhodocyclales > Zoogloeaceae > Azoarcus
Accessions
- Primary accessionA1KAB7
Proteomes
Subcellular Location
UniProt Annotation
GO Annotation
PTM/Processing
Features
Showing features for chain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Chain | PRO_1000050478 | 1-338 | Ketol-acid reductoisomerase (NADP+) | |||
Sequence: MKVYYDKDADLSLIKGKKVTIVGYGSQGHAHAQNLNDSGVKVTVAVRKGGASWDKAKAAGLKVEEIAKAVKTADLVMILLPDENIPQVYKEEVEPNIKKGATLAFAHGFNVHYNQVVPREDLDVIMVAPKGPGHTVRSEYLRGGGVPSLIAVYQDKSGKAKDIALSYAAANGGTKGGVIETNFKEETETDLFGEQAVLCGGAVELVKMGFETLTEAGYAPEMAYFECLHELKLIVDLMYEGGIANMNYSISNNAEYGEYVTGPEVINAQSREAMRNALKRIQTGEYAKMFIQEGKTNYPSMTARRRLNAEHPIEQVGGQLRDMMPWIKAKALVDKSKN |
Interaction
Protein-protein interaction databases
Structure
Family & Domains
Features
Showing features for domain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Domain | 1-181 | KARI N-terminal Rossmann | ||||
Sequence: MKVYYDKDADLSLIKGKKVTIVGYGSQGHAHAQNLNDSGVKVTVAVRKGGASWDKAKAAGLKVEEIAKAVKTADLVMILLPDENIPQVYKEEVEPNIKKGATLAFAHGFNVHYNQVVPREDLDVIMVAPKGPGHTVRSEYLRGGGVPSLIAVYQDKSGKAKDIALSYAAANGGTKGGVIET | ||||||
Domain | 182-327 | KARI C-terminal knotted | ||||
Sequence: NFKEETETDLFGEQAVLCGGAVELVKMGFETLTEAGYAPEMAYFECLHELKLIVDLMYEGGIANMNYSISNNAEYGEYVTGPEVINAQSREAMRNALKRIQTGEYAKMFIQEGKTNYPSMTARRRLNAEHPIEQVGGQLRDMMPWI |
Sequence similarities
Belongs to the ketol-acid reductoisomerase family.
Phylogenomic databases
Family and domain databases
Sequence
- Sequence statusComplete
- Length338
- Mass (Da)36,909
- Last updated2007-02-06 v1
- ChecksumD72BF43BDC7C4FB4
Keywords
- Technical term
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
AM406670 EMBL· GenBank· DDBJ | CAL95773.1 EMBL· GenBank· DDBJ | Genomic DNA |